My daughters both had nits but no visible live lice. The school nurse suggested that we mix equal parts of vegetable or olive oil and white vinegar, wrap the head with a plastic bag, and let it sit for at least an hour, and comb through with a nit comb. After that, we shampooed and rinsed. The vinegar loosens the glue which lets the nits slide free, and the oil suffocates the live lice. We did this once and had no further problems, plus the vinegar and oil are mild and chemical free!
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